Can we talk about JB Weld?

[Shaun @ Tru6]

Originally Posted by dad911

I don't see a CFM spec. Do you think I can I run that off a small jobsite compressor (occasionally, short duty cycle)

Absolutely. It's tiny so while it runs through a lot of air, it's a tiny little thing so I don't expect it would be a problem. Since it has no torque, it does need to run at high speed for any kind of cutting with dremel discs.

[jcommin]

It's amazing stuff - I use it in manufacturing production equipment. I have also used it repair the riveted part on my ash tray that goes in my 944.

[dad911]

Added to cart. Thanks Shaun!

[Geneman]

try devcon that stuff is amazing

[Rawknees'Turbo]

Originally Posted by dad911

I don't see a CFM spec. Do you think I can I run that off a small jobsite compressor (occasionally, short duty cycle)

I have two of those - probably my most used tool, and it requires very little air to run, even at max (I use it mainly with a 60 gallon, 4.5hp compressor and the thing barely needs to run if only the pencil grinder is being used). I've also used it with a tiny compressor, and no issue.

[Shaun @ Tru6]

Another epoxy that I HIGHLY recommend is Loctite's Hysol E-40HT. High temp, oil and gas resistant, truly structural. I called Loctite after buying a new steering rack for my 01 Tundra. The hydraulic threaded female on the rack was stripped out. Inside the box was a letter from the remanufacturer telling you to be careful, the threads easily strip and they won't take it back if they are. Of course someone did strip them and then returned it to Autozone and they sold it to me. Instead of trying to return it, I called Loctite and that's what they recommended. That was 4 years ago and rack is doing just fine. I use it on 928 intake cracks (cast magnesium) and never had a call back. Have used it in other situations, it's a true structural epoxy.

[Zeke]

All epoxies can be removed by heat. I don't agree with JWW's statement that it stays somewhat flexible but the term is subjective.

Yes, there are other products that mimic JB and most, if not all contain metal shavings as part of the 2-part composite. Original JB takes at LEAST overnight to get hard enough to machine. You can subject the part to low heat after the initial cure period, 2-3 hours at room temp. Locktite brought out a fast metal epoxy repair and then JB brought out theirs, in that order IIRC.

Then there's soldering on cast metal parts such as a carburetor body with zinc. An oversold product in that class is Muggy Weld. I buy my stuff at the LWS and it's not cheap.



Look at the 5th item in the list. It's tricky to use but you can actually do it with a good propane bottle torch with a pencil flame. MAPP gas is better but they don't sell that siht anymore. There are substitutes that burn slightly hotter than propane, like 130º hotter and that doesn't make much difference, so stick with propane. It's much cheaper.

Here's a video about the stuff. Nevermind that he destroyed the seal of the Welch plug at the end of the bore. I guess he now can solder that up.

[Bill Douglas]

Zeke, I've had success with Blue Demon aluminium brazing rods https://www.globalweldingsupplies.co.nz/product-page.php?sku=WDABD32 the trick was to get the aluminum very hot, but well short of melting, with a Map-pro torch then lightly dragging the alloy rod over it.

I did lots of testing on scrap aluminum.

[speeder]

Originally Posted by Shaun @ Tru6

That pneumatic pen is amazing, you can use it with precision that an electric Dremel would never dream of. It's a scalpel compared to a Dremel ax.

Thanks, I’ll pick one up. I don’t have a compressor here but I have one at home in CA. I’m thinking now that I’ll just repair it w a hand file, really carefully. Here is what I picked up today and the damage:

[TimT]

Marine-Tex is kind of a wonder epoxy similar to JB Weld.

Not sure of its availability in inland areas, but... I've used it (and JB) for some crafty fixes, that saved me time and money..

Marine-Tex

[wdfifteen]

Originally Posted by Shaun @ Tru6

It sands pretty well. use a pneumatic dremel pen and diamond bit for detail and hard to reach places.

Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder - 56,000RPM

Those pretty pictures put my “git ‘er done!” work to shame. I still like seeing them.
I worked with small pneumatic peens, repairing aluminum castings, when I was in college. Great little tools.

[Bob Kontak]

Originally Posted by TimT

Marine-Tex is kind of a wonder epoxy similar to JB Weld.

Not sure of its availability in inland areas, but... I've used it (and JB) for some crafty fixes, that saved me time and money..

If you have lakes there are boat places that sell it. I have used Marine-Tex several times.

[LakeCleElum]

Marine Tex = JB Weld X 10..........Both are good.....

[speeder]

Originally Posted by LakeCleElum

Marine Tex = JB Weld X 10..........Both are good.....

How so? I don’t need it to have Herculean strength, just bond well and be file-able. Also able to handle a small amount of fuel passing by it.

[87maniac]

I cure JB weld in the oven at low heat overnight.
It cures rock hard.

Without heat, it cures kinda flexy and softer.

JB Weld. Don't leave home without it.

[Dan J]

Originally Posted by Geneman

try devcon that stuff is amazing

Devcon 10760 is for the adults in the room Expensive but when it has to work It does

[1990C4S]

Originally Posted by speeder

I've never used the stuff, it always kind of had a bad inference for me because of a certain unscrupulous Porsche engine builder that we used to discuss here.

Maybe you should be more specific, since Wayne recommended it in his rebuild book.

[speeder]

Originally Posted by 1990C4S

Maybe you should be more specific, since Wayne recommended it in his rebuild book.

JB Weld? For what situation(s)?

[Bob Kontak]

Originally Posted by LakeCleElum

Marine Tex = JB Weld X 10..........Both are good.....

I would not rate Marine Tex ten times a good as JB. Maybe he means +10

Traditional JB Weld had 5020 psi of tensile strength. Marine-Tex, 4,000 psi.

There may be other factors that are better one vs the other but they are in the same ball park.

[Bob Kontak]

Originally Posted by speeder

JB Weld? For what situation(s)?

JB Weld
There are several spots on the case where an original bonding/sealing agent was placed. These are the places where a factory dowel pin or plug has been inserted into the case. JB Weld is an excellent heavy-duty epoxy that can be used to replace the dabs of factory epoxy that help seal some of these areas of the case and chain housings.

https://www.pelicanparts.com/cgi-bin/wizards/Parts_Wizard.cgi?command=step3&wizard_root=911_engine_rebuild